Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63fd647f5d2d55a…

MALICIOUS

PDF

71.1 KB Created: 2021-03-17 02:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 60b6d5f8eab07d1eece8f5161b5d9d71 SHA-1: 9d1b02dc88681c49412a1645061499441115643c SHA-256: b63fd647f5d2d55a00a37b01580d4a70ab459493787a937cd6ae6ee3ef8cf88e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/wix?keyword=craigslist+cabo+san+lucas+real+estate+for+sale PDF link annotation
    • http://pinudub.iblogger.org/new_york_city_criminal_justice_reform.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_3391fc8f65fc430ca47e60c2a0ec5b99.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_e2e5912951ed433aa32e44e5dd4498d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0055bf-0906-4ab8-914c-26ccd2fe11d6/juxeliruwonegewaxibides.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_e3a5df9ea1a340ca8a7a9795b6dd1349.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce262fe-380d-4881-9212-9facb49c45b0/93384722311.pdfIn PDF document text
    • http://gagelenobom.epizy.com/voltage_stabilizer_circuit.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_470ed48c59bc4e15829045624e88e8e1.pdf?index=trueIn PDF document text
    • http://veduredetud.epizy.com/carnatic_music_theory_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff58f58-a1ea-4a08-bfc8-544806feb799/canon_repair_code_b203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add971b5-2723-4039-b7db-80de2bd109fa/zovaburabezotakatudix.pdfIn PDF document text
    • http://dopozidimosopa.rf.gd/game_of_life_board_game_original.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1fea9c-1239-4108-b2e2-e118bd8f7331/acid_alkaline_food_chart_australia.pdfIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_0d562ddab6274850af78fd0c3f73381d.pdf?index=trueIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_2e4e87a3ff4e40f2889156f8c2bf8ba4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdba51f8-f3ed-41aa-80b2-352925849d77/sample_letter_of_intent_real_estate_purchase_free.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_828eee222e2d4b08a25dede0f728ed2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d65267-47cd-4574-b2f9-28d5df12d9a8/kewenibawejoxixozubozije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e45cf6-50ed-434d-8978-29b2ced7248a/dulumolazarugunolivagaf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 5092 bytes
SHA-256: 4b931b156378154e0473f650ad39c6c2f06e711e7492a440beb4fa2feba53cbf
font_01_sfnt_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 9892 bytes
SHA-256: b26f05c9e8999cbe46dc36a9acffbb395aee02097d05c89290b60c143a21d90c
font_02_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c